DE2407277A1 - ROTATING SOUND HEAD FOR TAPE RECEIVERS - Google Patents

Description

DIPL.-ING. LEO FLEUCHAUS DR.-ING. HANS LEYH

Dipl. -Ing. Ernst Rathmann

Munich 71, February 12, 1974

Melchloretr. 42

Sign: MO119P-11O7 + GH

Motorola, Inc. 9 401 West Grand Avenue Franklin Park , Illinois V. St. A.

Rotatable tape head for tape recorders

The invention relates to a rotatable tape head for tape recorders using at least two-track tapes, with a tape head bracket that depends on a given Signal event can be pivoted between two positions, with one or more columns in one position provided part of the sound head is assigned to one track position and another track position in the other position.

Multi-track tapes are used in all types of tape recorders, regardless of whether the tape is in a Cassette or on a simple spool is housed. To use the so called front and back of the tape to be able to, it has hitherto been necessary that the tape is removed and turned over after passing through one track,

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This applies to all cassette tape recorders and also to a large number of tape recorders in which the tape is on one simple coil is wound. In order to eliminate this inconvenience, it is already known to provide sound heads, which are provided with gaps for each track on both the front and the back of the tape, so that, the tape can be recorded or played both in forward and in reverse without being turned over got to. Such tape heads are extremely expensive to manufacture.

The invention is therefore based on the object to provide precautions that make it possible to use both a tape to be able to record or play in the forward as well as in the reverse without turning the tape around and special heads must be used.

Based on the above-mentioned head holder this object is achieved according to the invention in that the audio head holder is provided with an elongated part, which carries the tape head at one end, that the elongated part at its other end with a gear or a gear portion is provided with a corresponding gear drive is engaged, and that the Toothed drive is rotatable in such a way that the elongate part experiences a rotation about its longitudinal axis, the audio head is pivoted from the first position to the second position by rotating it through 180 °.

With such a tape head holder the possibility is offered in an advantageous manner that all tracks one Tape can be recorded or played back in slow forward or slow reverse, with only conventional audio

- 2 - ■ heads

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heads are used and the tape is not turned over

got to. ■ ·

Further features and refinements of the invention are the subject matter of further claims. ■

The features and advantages of the invention result from .sich from the following description of exemplary embodiments in conjunction with the claims and the drawing, it shows

Fig. 1 is a plan view of a first embodiment of the invention used in a cassette tape recorder finds;

FIG. 2 shows a plan view according to FIG. 1 in an enlarged illustration; FIG.

3 shows a side view of the embodiment according to FIG. 1 in an enlarged illustration;

4 shows a plan view of a further embodiment the invention;

Fig. 5 is a perspective rear view of the Ausfüh approximate shape according to FIG. 4;

6 shows a perspective side view of the embodiment according to FIG. 4;

FIG. 7 shows a partial section in a side view through the actuating mechanism of the embodiment according to FIG Fig. 4.

In Figs. 1 to 3 is a rotatable head support for

- 3 - a

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a cassette tape recorder is shown, a portion of which is shown. However, the head mount can also be used for others Find tape recorders use in which the tape is either held on a reel or a winding core. When a cassette 12 is inserted into the slot of the cassette tape recorder, the audio head 14 rests on the audio tape 15 on, wherein the audio head column 17 is a track position of the tape 15 are assigned. The tape runs according to the arrow 11 from left to right until the left-hand roll ran right past the tape head. In order to be able to run through the so-called back of the tape, is it is necessary with the known devices to remove the cassette, turn it over and insert it again. This is supposed to be with the Tcnkopfhalterung can be avoided according to the invention. For this purpose, the audio head 14 is rotatable through 180 °, so that the audio head gaps 17 according to FIG. 3 from the upper position be pivoted into the lower position. In this position of the tape head, the tape can with the other track position in the slow rewind at the sound head columns 17 for recording or playback.

The audio head holder for pivoting the audio head 14 includes a shaft 18 which is rotatably supported in bearings 21 and 22 in a bearing housing 20 and a housing at its front end 16 for the tape head 14 carries. The bearing housing 20 is connected to the chassis 2 3 of the tape recorder and allows both a rotary movement of the shaft 18, as well as a longitudinal displacement. There is also a gear 24 on the chassis of a worm drive which engages in a worm 34, which can be rotated either by hand or electromechanically when the tape adopts an end position. This can be done on the tape is provided with a contact strip at the end of the tape which triggers the excitation of an electromagnet for the electromechanical drive. The rotation of the

- 4 - gear

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Gear 34 counterclockwise causes an elliptical cam 32 connected to gear 24 is, comes into engagement at the end face 31 with a bevel pinion 30 arranged at the end of the shaft 18, and the shaft 18 moves against the pressure of a spring 36 in the longitudinal direction. The tape head IH comes out of engagement with the Tape 15. The bevel pinion then runs onto a section 28 of a ring gear which is essentially coaxial is arranged to the gear 24 and rotates with this together. The bevel pinion 30 is rotated and with it the shaft 18. With the number of teeth provided on the section 28, the rotation of the bevel pinion through 180 ° can be set in such a way that the bevel pinion disengages from section 28 when this angle of rotation is reached of the ring gear comes. When the end face 31 of the bevel pinion runs off the elliptical cam disk 32 moves the spring 36 drives the shaft 18 in the opposite direction and brings the tape head 14 into engagement with the tape in a different tracking position. The tape can now be reversed Direction in recording or playback mode can be moved past the tape head. As soon as the end of the tape is reached again is, the swiveling process of the tape head is repeated, by continuing to turn the gear 24 counterclockwise and the bevel pinion 30 with the section 29 of a ring gear comes into engagement after the sound head by running up the bevel pinion on the elliptical cam disk 32 is lifted off the belt. ·

4 to 7 is a further embodiment of the invention shown, in which in a cam track 46 in a base plate 48, a track pin 50 against the force of a spring is guided to lift a tape head 52 from the tape 54, to rotate the tape head by 180 ° and with the tape 54 to re-engage.

• - 5 - The

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The rotatable head holder can be used by hand or by hand can also be operated electromechanically. In Fig. 7, an electromagnet 56 is shown, which over a rod. 57 with a drive pin 58 is connected. This drive pin 58 extends up through a slot 60 in the Base plate 48 and further through an opening 64 in a rotatably mounted toothed plate 62, up to a slide 66. When the electromagnet 56 is excited, the rod 57 is in accordance with the representations according to FIGS. H, 6 and shifted to the right to bring the tape head 52 out of engagement with the tape 54. The drive pin 58 is with the Rod 57 connected so that the drive pin in the slot 60 is also shifted to the right and so is the carriage 66 and the tooth plate 62 moves away from the tape. Since the bracket 84 for the audio head 52 has ball bearings 86 and 88 is connected to the carriage 66, the tape head is lifted off the tape when the carriage is moved. During this displacement of the carriage, the spring 59 is tensioned at the same time, which applies the necessary force, in order to bring it back into engagement with the tape after swiveling the tape head.

The carriage 66 is attached to two guide rails 68 and 70. Of these, the guide rail 68 engages in two cam slots 72 and 74, which are in two guide webs. 76 and 78 are provided. These guide slots 72 and 74 'are designed in such a way that they initially lift the slide slightly when it is moved longitudinally. The guide rail 70 is guided in cam slots 80 and 82, which are also provided in the guide webs 76 and 78. By this cam slots in a substantially horizontal displacement of the carriage is effected, where, however, the head 52 of the base plate 48 is raised somewhat with respect to at lift-off first.

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The mounting bracket 84 for the audio head is on the carriage 66 as already mentioned, held with the help of ball bearings 86 and 88. When energizing the electromagnet 56, what with Can be done using a contact strip at the end of the tape The drive pin 58 and thus also the carriage 66 are displaced from left to right via the rod 57 according to FIG. 7. The guide rail 68 initially runs upwards in the cam slots 72 and 74 - in order to raise the audio head so far, that it comes free from the base plate 48 when it is rotated. The track pin 50 runs in the direction of the cam track 46 the arrows indicated in Figs. 4 and 5, the track pin at point 90 of the cam track a transverse displacement longitudinally the transverse web experiences. The one on the Toothed plate 62 attached tooth web 92 not only away from the tape, but also shifted from right to left according to FIG. 5, whereby the gear 94 engaging in the toothed web 92 runs off at the end of the mounting bracket 84 on the toothed web and pivoted the bracket. This transverse displacement of the track pin also causes the toothed plate to pivot 62 clockwise around pin 58, with pin 96 along an arcuate slot 6 5 in tooth plate 62 is moved.

After the sound head has been rotated through 180 °, the tensioned spring 59 guides the drive pin 58 in the slot 60 of the base plate back again to bring the tape head 52 with the tape 54 into engagement. "The track pin 50 runs along the straight path 108 of cam track 46.

If the electromagnet is further excited, the sound head is again removed from the tape while lifting at the same time moved and pivoted counterclockwise, the tracking pin 50 following the arrows in the cam track 46 from

- 7 - point

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Point 104 extends across to point 110. In this position the tape head is already swiveled by 180 ° and can be brought back into contact with the tape. As can be seen from the description above, with Help of the invention in a simple manner a pivoting of the sound head can be made by 180, so that the use of multi-track tapes is possible in forward and reverse without the tape having to be turned. Included conventional sound heads can be used.

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Claims (3)

2A07277 MO119P-11O7 + GH Claims [ly \ Rotatable tape head for tape recorders using at least two-track tapes, with a tape head holder which can be pivoted between two positions depending on a given signal event, in one position the part of the tape head provided with one or more columns of one track position and in the is assigned to another position of another track position, characterized in that the audio head holder is provided with an elongated part (18; 66) which at one end carries the audio head (14, 52), that the elongated part at its other end with a Gear wheel (30) or a gear wheel section (94) is provided which engages with a corresponding gear drive (24, 62), and that the gear drive is rotatable in such a way that the elongate part experiences a rotation about its longitudinal axis, wherein the sound head is pivoted from the first position to the second position by a rotation of 180. 2. Rotatable tape head according to claim 1, characterized in that the elongated part is a shaft (18) which at one end carries the audio head (14) and at the other end a bevel pinion (30) that a preferably electromagnetically driven worm - 9 - pinion 409834/0 871 MO119P-11O7 + GH drive engages with the worm (34) in a gear (24), which carries an elliptical cam disk (32) and two sections (28, 29) of a ring gear that When the gear wheel (24) rotates, the cam disc rests against the face (31) of the bevel pinion (30), and first the shaft (18) moves in the longitudinal direction, where lifted off the tape head (14) from the tape (15) is that when the gear (34) continues to rotate, the bevel pinion (30) with a portion of the ring gear in Engagement comes and together with the shaft and the tape head from one position of the tape head to the other Position can be pivoted by 180 ° to after this pivoting out of engagement with the traversed section of the ring gear to come, so that the shaft due to a return spring 36 again in the longitudinal direction is displaceable in such a way that the sound head on the. Tape comes to the system. 3. Rotatable tape head according to claim 1, characterized in that the elongated Part consists of a slide (-66) on which a mounting bracket (84) is rotatably attached to the tape head at one end and a toothed washer at the other end (94) carries that a toothed plate (62) is pivotally attached to the slide, one with the toothed disk (94) engaging tooth web (92) that a drive device (56, 57, 58) is present is, with which the carriage (66) is displaceable in the longitudinal direction, the toothed plate having a pivoting movement thereby learns that a fixed to the tooth plate Tracking pin is displaceable along a cam track (46) arranged in the base plate (48), around which Mounting bracket (84) and thus the sound head by 180 ° - 10 -. pivot 409834/0871 44 MO119P-11O7 + GH pivot, the tape head is out of engagement with the tape. 409834/0 8 71